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Simulating Two-Dimensional Recognizability by Pushdown and Queue Automata

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Implementation and Application of Automata (CIAA 2005)

Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 3845))

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Abstract

The aim of this paper is to investigate sequential models to describe two-dimensional languages. The intent is to add more capabilities to 4NFA in order to encompass a wider class of languages. We show that any (tiling) recognizable language can be simulated by a 4NFA with an extra queue whose size is bounded by the minimum of the two dimensions of a picture; and that 2NFA (i.e. automata moving only in two directions) with an analogous queue are sufficient when the alphabet is unary. A special class of recognizable languages can be simulated also by 4-way pushdown automata with a stack of size bounded by the sum of the two dimensions of the picture. Such a class is also characterized by a recursive definition involving the operations of union, intersection and a new diagonal overlapping operation applied to languages recognized by 2NFA.

Work partially supported by MIUR Cofin: Linguaggi Formali e Automi: Metodi, Modelli e Applicazioni.

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Author information

Authors and Affiliations

  1. Dipartimento di Informatica ed Applicazioni, Università di Salerno, I-84081, Baronissi (SA), Italy

    Marcella Anselmo

  2. Dip. Matematica e Informatica, Università di Catania, Viale Andrea Doria 6/a, 95125, Catania, Italy

    Maria Madonia

Authors
  1. Marcella Anselmo
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  2. Maria Madonia
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Editor information

Editors and Affiliations

  1. Sophia Antipolis, Laboratoire I3S, Les Algorithmes - bât. Euclide B, Université de Nice, 2000, route des lucioles, BP 121, 06903, Sophia Antipolis - Cedex, France

    Jacques Farré

  2. Sophia Antipolis, Ecole Polytechnique, Université de Nice, 930, route des colles, BP 145, 06903, Sophia Antipolis - Cedex, France

    Igor Litovsky

  3. Laboratoire I3S, Université de Nice, Sophia Antipolis & CNRS, France

    Sylvain Schmitz

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© 2006 Springer-Verlag Berlin Heidelberg

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Anselmo, M., Madonia, M. (2006). Simulating Two-Dimensional Recognizability by Pushdown and Queue Automata . In: Farré, J., Litovsky, I., Schmitz, S. (eds) Implementation and Application of Automata. CIAA 2005. Lecture Notes in Computer Science, vol 3845. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11605157_4

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  • DOI: https://doi.org/10.1007/11605157_4

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-31023-5

  • Online ISBN: 978-3-540-33097-4

  • eBook Packages: Computer ScienceComputer Science (R0)

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